Improvement in machines for bending tubes



M. MGWILLIAM'S. MACHINES Fon BENDING Tln'ln?.s,vzc.V

Patented-Dec. 21,1875.

MMM M//VM N.PETERS. PHO

UNITED STATES PATENT (DEEIcE.I

MICHAEL MowiLLIAM's, 0E DETROIT, MICH., As'sreNoE To HIMsELE, JosEPH MCWILLIAMS, AND EDWARD DEVINE, OF SAME PLAGE.

IMPROVEMENT* IN MACHINES FOR BENDING TUBES, &c.,

Specification forming part of Letters Patent No. 171,402., dated December 21, 1875; application filed October 9, 1875.

To all whom it may concern:

Be it known that I, MICHAEL MCWIL- LIAMs, of Detroit, in the county of Wayne and State of Michigan, have invented an Irnproved PipeBending Machine, of which the following is a specification:

My invention has for its object to furnish a machine by means of which wrought-iron pipes can be bent to any desired angle; and it consists in the combination ot' the principal operative parts, all as more fully hereinafter explained.

Figure l'is a plan View showing a pipe laid in the machine ready to be bent. Fig. 2 is a similar view, with the pipe bent. Fig.3is a bottom perspective of the rotating former. Fig. 4 is a longitudinal section on the line x a', in Fig. 2.

In the drawing, A represents the bed-plate, near the right-hand side of which is pivoted a sheaveB, having a half-round groove in its eri herv. B1 is a similar sheave cast with P P a pinion, B2, on its bottom, the whole being pivoted to a block, B3, which slides loosely in a dovetail way, a, in the bed-plate. (l is a former, having a semicircular end, inthe sides and rim ot which is a half-round groove. Se-v cured to the bottom of the former is a geared segment, C1, whichV engages With the pinion B2 Iwhen the machine is in operation, the former and segment being' pivoted to a block, C2, which slides in the dovetail Way above mentioned. rIhe former and segment are rotated by a lever, D, pivoted to the under side of the former, its outer end projecting from under the same between two studs, d d, against which it strikes. E is an arm projecting from the left hand of the lever D, having an upturned end, e, to clasp the pipe when laid in the former. Fis an eccentric lever, pivoted at f to the projection f -ot' the plate. The eccentric lever is connected by a hook, g,to the tail ot the block C2, and by which the latter is moved back and forth in the operation of the machine. To bend a pipe the block C2 and former are retracted by means ot' the eccentric lever. The pipe, properly heated, is laidin the grooves ot' the sheaves, when the former is turned to the lett, and moved up to it. At the same time the segment is engaged with the pinion under the sheave B. The pipe may now be bent to an.)r degree of curvature required by throwing around t-he former. The pinion ot' the sheave B1 being of less radi us than the segment the said sheave will rotate more rapidly than the former, and consequently draw the pipe faster on the outside of the curve, .thereby preserving the shape ofthe pipe in the bend. The sheave Bl and the former may be changed for others to tit various diameters ot' pipe. The eccentric lever serves as a lock to keep the former in place, whilea pipe is being bent; but I do not Wish to contne myself to the use ot' such lever for advancing and retracting the former, as there are various means by which the same eftect 4could be accomplished.

What I claim as my in vention is- In a bending-machine, substantially as described, the combination of the geared sheave pivoted to asliding block,with the geared former also pivoted to a block sliding in the same ways in the bed-plate, substantially as, described. Y

MICHAEL MCWILLIAMS.

Witnesses:

' H. S. SPEAGUE,

CHARLES J. HUNT. 

